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avcodec/hevc_mp4toannexb_bsf: Check nalu_size

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Fixes: Timeout (29sec -> 5ms)
Fixes: 20237/clusterfuzz-testcase-minimized-ffmpeg_BSF_HEVC_MP4TOANNEXB_fuzzer-5165615044362240

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit ae2537f53e8ebfa36345241b5b70c0b1aef66dd2)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-04-19 18:24:55 +02:00
parent 56774297bb
commit a1c51c0713
1 changed files with 5 additions and 0 deletions
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5
libavcodec/hevc_mp4toannexb_bsf.c
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@ -161,6 +161,11 @@ static int hevc_mp4toannexb_filter(AVBitStreamFilterContext *bsfc,
for (i = 0; i < ctx->length_size; i++)
nalu_size = (nalu_size << 8) | bytestream2_get_byte(&gb);
if (nalu_size < 2) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
nalu_type = (bytestream2_peek_byte(&gb) >> 1) & 0x3f;
/* prepend extradata to IRAP frames */